Van Geet Repertoire

Napoleon himself used to play 1. Nc3 e5 2. Nf3 on occasion. vs de Remusat, for instance.

Try game 2: The Games of Napoleon Bonaparte - Chess.com

On lichess you will see this Nc3 e5 Nf3 variation referred to as the Napoleon attack. Whether that's the "official term" for the opening, if there even is such a thing, I don't know... at this point in the internet age I think lichess and chess.com explorers have basically become the chess dictionary. But alas sometimes there is not even agreement between these two sources

whats the point of playing 1.nc3 if you are literally going to play not a single independent line? You may as well play 1.e4 or 1.d4 and keep the opponent guessing between 2.nc3 and more mainline opponents.

Technically your opponent isn't going to know whether you will play an e4, d4, or unique position until you make the transposing move, they will be guessing until then regardless. 
You could derive benefit from just throwing people off in how they respond to Nc3 since people rarely face it but yeah to get the full benefit you should play independent lines.